Quote:
Originally posted by MadDogMe
I though the wall thickness was for structural strenght and the secondary impingment was 'incidental'?...
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They really are symbiotically linked. Quite a few things at play on that one.
You want the structural strength, true, and the cup walls give you that, so they are a necessary evil. The cups walls are also there to contain the off-flow from the jets to stop the jets from interfering with each other, so again they are necessary. The off-flow from the primary jet can be used as a "secondary" impingement. This secondary impingement is deliberate and not incidental because the cup width can be such that the impingement's efficiency is reduced. Since we
have to have the walls there, we may as well make use of them in the conduction element of the cooling of the block to allow heat somewhere to go in extremely low flow scenarios otherwise the design will suck at low flow when the impingement effects start to lose their power.